// Thanks to: https://github.com/airyland/vux/blob/v2/src/directives/transfer-dom/index.js
// Thanks to: https://github.com/calebroseland/vue-dom-portal

/**
 * Get target DOM Node
 * @param {(Node|string|Boolean)} [node=document.body] DOM Node, CSS selector, or Boolean
 * @return {Node} The target that the el will be appended to
 */
function getTarget(node) {
  if (node === void 0) {
    node = document.body
  }
  if (node === true) { return document.body }
  return node instanceof window.Node ? node : document.querySelector(node)
}

const directive = {
  inserted(el, { value }, vnode) {
    if (el.dataset && el.dataset.transfer !== 'true') return false
    el.className = el.className ? el.className + ' v-transfer-dom' : 'v-transfer-dom'
    const parentNode = el.parentNode
    if (!parentNode) return
    const home = document.createComment('')
    let hasMovedOut = false

    if (value !== false) {
      parentNode.replaceChild(home, el) // moving out, el is no longer in the document
      getTarget(value).appendChild(el) // moving into new place
      hasMovedOut = true
    }
    if (!el.__transferDomData) {
      el.__transferDomData = {
        parentNode: parentNode,
        home: home,
        target: getTarget(value),
        hasMovedOut: hasMovedOut
      }
    }
  },
  componentUpdated(el, { value }) {
    if (el.dataset && el.dataset.transfer !== 'true') return false
    // need to make sure children are done updating (vs. `update`)
    const ref$1 = el.__transferDomData
    if (!ref$1) return
    // homes.get(el)
    const parentNode = ref$1.parentNode
    const home = ref$1.home
    const hasMovedOut = ref$1.hasMovedOut // recall where home is

    if (!hasMovedOut && value) {
      // remove from document and leave placeholder
      parentNode.replaceChild(home, el)
      // append to target
      getTarget(value).appendChild(el)
      el.__transferDomData = Object.assign({}, el.__transferDomData, { hasMovedOut: true, target: getTarget(value) })
    } else if (hasMovedOut && value === false) {
      // previously moved, coming back home
      parentNode.replaceChild(el, home)
      el.__transferDomData = Object.assign({}, el.__transferDomData, { hasMovedOut: false, target: getTarget(value) })
    } else if (value) {
      // already moved, going somewhere else
      getTarget(value).appendChild(el)
    }
  },
  unbind(el) {
    if (el.dataset && el.dataset.transfer !== 'true') return false
    el.className = el.className.replace('v-transfer-dom', '')
    const ref$1 = el.__transferDomData
    if (!ref$1) return
    if (el.__transferDomData.hasMovedOut === true) {
      el.__transferDomData.parentNode && el.__transferDomData.parentNode.appendChild(el)
    }
    el.__transferDomData = null
  }
}

export default directive
